From: Vlad Yasevich <vladislav.yasevich@hp.com>
To: David Miller <davem@davemloft.net>
Cc: rick.jones2@hp.com, gerrit@erg.abdn.ac.uk,
netdev@vger.kernel.org, weid@np.css.fujitsu.com
Subject: Re: [NET]: Please revert disallowing zero listen queues
Date: Fri, 09 Mar 2007 14:14:35 -0500 [thread overview]
Message-ID: <45F1B21B.7010402@hp.com> (raw)
In-Reply-To: <20070306.111142.07639258.davem@davemloft.net>
David Miller wrote:
> From: Rick Jones <rick.jones2@hp.com>
> Date: Tue, 06 Mar 2007 10:54:00 -0800
>
>>> So we're not "disallowing" a backlog argument of zero to
>>> listen(). We'll accept that just fine, the only thing that
>>> happens is that you'll get what you ask for, that being
>>> no connections :-)
>> I'm not sure where HP-UX inherited the 0 = 1 bit - perhaps from BSD, nor
>> am I sure there is official chapter and verse, but:
>>
>> <excerpt>
>> backlog is limited to the range of 0 to SOMAXCONN, which is defined in
>> <sys/socket.h>. SOMAXCONN is currently set to 4096. If any other
>> value is specified, the system automatically assigns the closest value
>> within the range. A backlog of 0 specifies only 1 pending
>> connection is allowed at any given time.
>> </excerpt>
>>
>> I don't have a Solaris, BSD or AIX manpage for listen handy to check
>> them but would not be surprised to see they are similar.
>
> Ok, that seals the deal for me, I'll revert the change :)
Ahh, crap. Even Posix wiesel-words around this issue:
> A backlog argument of 0 may allow the socket to accept connections, in which case
> the length of the listen queue may be set to an implementation-defined minimum value.
(from http://www.opengroup.org/onlinepubs/009695399/functions/listen.html)
No, to go and fix the SCTP spec....
-vlad
prev parent reply other threads:[~2007-03-09 19:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-06 13:32 [NET]: Please revert disallowing zero listen queues Gerrit Renker
2007-03-06 18:37 ` David Miller
2007-03-06 18:45 ` David Miller
2007-03-06 18:54 ` Rick Jones
2007-03-06 19:11 ` David Miller
2007-03-09 19:14 ` Vlad Yasevich [this message]
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